Relay valve with integral biased double check valve

US6179391A · kind A · utility

Assignee

• AllliedSignal Truck Brake Systems Company · US

Inventors

• Charles E. Eberling · Wellington, US
• Gary R. Hendershot · Amherst, US
• John Kemer · Avon Lake, US
• Andrew Marsh · Elyria, US
• Richard T. Ross · Chester, US
• Chris G. Swansegar · North Olmsted, US

Key dates

• Filing date: Feb 1, 1999
• Grant date: Jan 30, 2001
• Expiry date: Feb 1, 2019

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T13/261
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A braking system is able to meet emergency stopping distance requirements associated with a failed rear axle service control line by modifying the service relay valve. The service relay valve incorporates a biased double check valve so that an additional or secondary control line from the foot control valve communicates with the service port of the relay valve. If the primary circuit is operational, a biasing force imposed on the double check valve permits normal operation via the primary service line. On the other hand, if the primary service line is lost, the biasing force is overcome and communication between the secondary service line and the service port of the relay valve is established.